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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables, net of fees | $ 66,776 | $ 64,702 |  |
Less: allowance for loan losses | (1,928) | (1,886) | $ (1,835) | $ (1,978)
GM Financial receivables, net | 64,848 | 62,816 |  |
Retail Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables, net of fees | 59,503 | 58,093 | $ 53,397 |
Less: allowance for loan losses | (1,884) | (1,839) |  |
GM Financial receivables, net | 57,618 | 56,254 |  |
Commercial Finance Receivables |  |  |  |
Finance Receivables [Line Items] |  |  |  |
GM Financial receivables, net of fees | 7,274 | 6,609 |  |
Less: allowance for loan losses | (44) | (47) |  |
GM Financial receivables, net | 7,230 | 6,562 |  |
Dealer cash management balance | 1,200 | 1,000 |  |
Level 2 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | 7,230 | 6,562 |  |
Level 3 |  |  |  |
Finance Receivables [Line Items] |  |  |  |
Fair value of GM Financial receivables | $ 57,774 | $ 57,613 |  |

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